[PATCH] Remove unused libgfortran functions

[FX]

I followed up with the following patch, committed as revision 243841, removing the old _gfortran_ftell and renaming the modern _gfortran_ftell2. It was bootstrapped and regtested on x86_64-apple-darwin16.3.0.

This is the last item from https://gcc.gnu.org/wiki/LibgfortranAbiCleanup <https://gcc.gnu.org/wiki/LibgfortranAbiCleanup> which I feel comfortable addressing.

FX

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